Redeem firstborn sons and give the money to a priest

"Every first issue of the womb of all flesh, whether man or animal, which they offer to the LORD, shall be yours; nevertheless the firstborn of man you shall surely redeem, and the firstborn of unclean animals you shall redeem.

Hebrew

טו כָּל-פֶּטֶר רֶחֶם לְכָל-בָּשָׂר אֲשֶׁר-יַקְרִיבוּ לַיהוָה, בָּאָדָם וּבַבְּהֵמָה--יִהְיֶה-לָּךְ: אַךְ פָּדֹה תִפְדֶּה, אֵת בְּכוֹר הָאָדָם, וְאֵת בְּכוֹר-הַבְּהֵמָה הַטְּמֵאָה, תִּפְדֶּה.

Greek

15 καὶ πᾶν διανοῖγον μήτραν ἀπὸ πάσης σαρκός, ἃ προσφέρουσιν κυρίῳ ἀπὸ ἀνθρώπου ἕως κτήνους, σοὶ ἔσται· ἀλλ᾿ ἢ λύτροις λυτρωθήσεται τὰ πρωτότοκα τῶν ἀνθρώπων, καὶ τὰ πρωτότοκα τῶν κτηνῶν τῶν ἀκαθάρτων λυτρώσῃ.

• Parashah: Korach
• Sefer HaChinuch: 392
• Mishneh Torah: Seeds — First Fruits and Other Priestly Gifts Outside the Temple

• Numbers 18:15

Enumeration and classification from BibleData. The Greek is the Septuagint reading of the same verse, carried by the source for comparison.